Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb536c54526925b24fa6448affac640bda3ffd677f7fd7e19a60ae820cb3f56' 
  AND token = 'LRghoTI3HVC/wkefPQ+Z7qKqMIrr+woEqQDDZ+bI2cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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