Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef90ba26e8a6e42f60da562f92693c9dfe92d5542f6544c62c7cff2c5cf9a2c' 
  AND token = 'PJVEyR4mpz/2HvNlnbEsQRc8TkxeJHYiofZgVX8wmt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}