Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a686f31dacf88bb0121cdeac1aa626bd894afbe34c714d523f25c324eb61494c' 
  AND token = 'zsAeyAKd7Qn5AGlJfrxoHDKZOIcdEGZ43c9qXyzrQl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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