SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ea0737302f53eca24d991f130ec85d5e571c147946b2d41049fcf556b62c111b' 
  AND token = 'MVumX9HqfKd0rj+A/pmKSMKDBHr4EdU8cfvADLt2WgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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