Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e99d47f60d647cf7c23a3c1fbec39ecb3a1fef37dfade80292750babaaac243' 
  AND token = 'Kk8aFta3GbJmXugaeqLN/UD+n+dPxx7E7Q5nagv9WuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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