SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '05271e7c707e580851c3f7cfdfcef9a29e6a4516851a269197b0c1d90f641364' 
  AND token = 'uIhNCaHOKSoratMSNoclUl+VtlDgRKGzaU8o4cq5w6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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