Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b256dd60c6bb81fba9f221e021b22d6a17c55d3d4342160e038390401b66ff66' 
  AND token = '6+j8feERdr9wXYeYu0ycBdW9apvxfvEfyOyB3jWaigo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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