Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f2589c4d6a42d684c933cad876ba28b7790283dc12071162cbdaf5f33eebd1' 
  AND token = 'c3SZPjo4Cx5CZMy76KBBzyEX7bJQua6W84LY2XOgEnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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