Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15303ce634e9a902f9f542b858bff7464c0fed1be607e67bcd7981e1fceb3fab' 
  AND token = 'efE2j3/DFJhA6ZqMteanaNYKLnUs7uNGY6xlAqWSAZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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