Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b835744cd1b9abf4da3fffb78cc56c9a0af0f4d2b28236e8b76ccda787421c4c' 
  AND token = 'WVHSFHnuebtki4FT9zUh3WjSzkNRI5d52KuaPyraY/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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