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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ffbfad9e76ebf2dfa0b697a2c92a3d8483415e6122cc1b11fae5cc265e977e34' 
  AND token = '5GV2tDWSdRc8M387ZTXyUYS/Z15wbyWp+D6W7jLSIIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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