SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0948d8e45989fa1f30e3c53245b73f97e7f6ea0b5a176dc71505aa5411914284' 
  AND token = 'pR0abYuuNN6/yJGLLjX7Bt5/XLbI0PsFLqqJrFpQSgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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