Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f098a44c40be2a5b58d07b00081f9cc93b4868f3a1ddce3a6a34f3bde2ceb5' 
  AND token = 'UDu3V1ysrW5NOhJEH9x6Neg9LdSmoqrafVvhFm6MR5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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