Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c96494854c5f6c20ce540c7d2b45bee1e1e0b70ba70802803eb456411315e42' 
  AND token = '0u1KxCX076wO2CwRQX5UaFcyjZSCudWJvtWgf8EVtNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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