Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab6af2bc4637d894f67c91b43abaf8cb778bbc82ee60f6bd241279a41108704' 
  AND token = 'RpLu+9YfUlhj+f0xct/f+2u2wNbDR+xIrjwHKvvGJiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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