Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '727e47b12b4636c7725d534689a24dd596ce9d1c2367ca0b2665cff3229bb583' 
  AND token = 'z1MCKq0d09BEnad/vCidtqOtSRkdA2ptn1rAM2sWa2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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