Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb684737cc34fbe5c544ef0f58556503762f364b20149b620e30c9e3dc7a50a' 
  AND token = '9t4R4XuPW/OCWLqlttMzF1XCFRtenyO4kdULkjGb2YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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