Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5dc74af8031a734895deded7ec1db94993bb239f6ed4d555a70ef59425ce42' 
  AND token = 'Vt8KLPBWfDeqbIk9iDUQ8Nh9RH1jLBSP+MbksH1ji9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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