Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f54323338eb252c8e64db423498c8f115fa4b45871c2876b21e8de758bfab5f' 
  AND token = 'iA57KRWZ7FVxEL4tR/GfysIcbv79kg3UqZ1kPE8OuDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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