Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32ede02ccd55520f0a064026f3590dff9c9b735b9e97b017fc468a3732252e3' 
  AND token = 'm71ktNcCID3Aa13b4LtU7fYvRXVEzCA+316scNovw4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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