Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9877a18f983262f123784f916ce31ab432ce984ed8a0c511bed1195290f3fe5' 
  AND token = 'YTJhFRiA2aHiGlBPliP3EyWojwpC7Rm+xLbgsn9yd2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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