Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c6f2cf66fcb8075395ef16a22bd030f323ce7aa3c634ff866457e4a7587d45' 
  AND token = 'TAx3KUquJG78D3bISii/AFTT98XhBq0xFytIcUNIl64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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