Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a88e590a4670bda00d072eee6be2545dff99ffaaba73730cf6458489bb1af10' 
  AND token = '/LqBnpaet0baBSDLY+cvhbvT7WtTqNlghiPpjlePZg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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