Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1789e9cafd37cfe0d1d78a8aa50458370a1a0f3d697f918b300e82892375c42' 
  AND token = 'sJI75nUp4RDf6tIZugr6NhZ4hVsHzTIccXC8iL1qCKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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