Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf0a7a3ea7d6b563bb5e00584a5f1058c6cfb55d929a2795205ce0d2ed0e096' 
  AND token = 'u5doi80cf6WYnq2evgwCbMUmgOYAXaLBiyMrG9XaxBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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