Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d3998f8a813d76f4bc424dbb36c7bb673b8c3b1b4303c274c3d7c992c8bd99f' 
  AND token = 'y0vr7M1u6vuZwYDR69qrGs81/WjKBb6JAKCwYf24v+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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