Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b201a1590cf8c751ff78ea87dd7fa9b8ad9b345fa8a6efcf5d21cccaf2a81e6' 
  AND token = 'ZmPBvVvj1Qp3oUxiTHHNSbEEOZ1SpYMq79XAcVAEtLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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