Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9dbc2d111d762f17e413bfe897b0c9e91eb42fff3b39f1a31c2e73548a09987' 
  AND token = 'XeBKI9L8txX4VeIbbm86WQSN5MswUsEMMWqWOjNT2D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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