Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73dd008b2bcb44f8f3bea2021cd4c8ec4c809d54798cc4050b9f486c257ae3cb' 
  AND token = 'x4CYWaOxlnRbrsGC7kaf2BcNb0qf+FHPjEy8PQzTWBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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