Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90f10c521e26553b32c170a418ca898e0d921d61519b66b16a2bd4977e56d49' 
  AND token = '2iOlydQ2mirC39KnCE1rbLjdJYfTMlYY2OmdcZ82GZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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