Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6397993099ec97d8d59b08a34b66b0877a334ec717bbe78211fc1ae09423bd07' 
  AND token = '77VRNY97rI6Jd+dmrEkqYDyXq517nzF4aR5xqLftLwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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