Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f3a2a532cb66d3e585645bcd5a1d7bbd1f4cac2e1bfea40130e4ab485aedbe' 
  AND token = 'EdDQn+tfnvIQYGpbEB5kjaNimX8gZesqfu1yBVs3Vf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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