Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88db5c3adb81bd75c5b5373408146a22507dec9c4c52e8ae66e6c448fe05e7b0' 
  AND token = 'c0hu2jnJkJ7areBxDTTJkolReo8YMrCrZXPA9w/++3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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