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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4ea01301cc697d32d7812b31ccc98a819cae9a5b40654074598ef72106b95a50' 
  AND token = 'LBvW6OLi8I/kgYf2joblj42/aex5NrfTUEaL2eZXwXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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