Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851708dc2ee735ab75825ed829c95ff04b6a8d4eb6f3171f330f35bfb38928b2' 
  AND token = '/0tgd9OtfyNlCHWlsSC2LmnCSopP9+pk1baspZHcYzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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