Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678fe98756c655e6e1f4e0631ec2a8550e9eaa47d6cc7e4bcceb1e3434128d62' 
  AND token = 'PUlqu5ZQhF6xFHKZ5LAK28vABSOFntS/wNn+u3YxptI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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