Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd303dddc1873ab6b3326b4607592cb877e153ffc2bf7aada2836ccf2bf638b1a' 
  AND token = '4s9NWaiP1QVPT7y0rrcG8yZmfibhawZZm8i6qlYiP+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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