Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d51f9762b6284217529dbe8d3d8c988c9935de2d3198cb99a49c194ed79886a' 
  AND token = 'PBS2HQ8vle+ON5GO22SgjLyQ7X+NxsMuUznt+ilOqkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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