SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ecaafed7fe630436147fdea3162b75054795e289fa03a32fb82872042a4a8b63' 
  AND token = 'gbtNZ5UVHGDj3T6L4RMRFFgN5f/0za1g8ndlBMQGZ/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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