Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21be665fe003a21e52eea074412a26f6d75cf38de9bf35fb9fbcf0b60304f793' 
  AND token = 'A+u3s0mWYwxVzeA5f2uOD9pHuPrgCrmFH7zUHp7S/gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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