Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8619374a1c46e9e15512654efdc1e1a2d6750f65d176c970bd8a70794f8a727d' 
  AND token = 'VY8lKNIzCNx0gKfwOrUSho+I6gHWrMdCmKxU7/vvoQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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