Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a06bf0460c82a2c6e780a39c3c833a97d7b52e56781ee3a83180eb84c77e91' 
  AND token = 'uomyWJx3I5C9183qRrcLAtcrllhfTCnHiB+rhq3kNJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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