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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '342149899da2c16240703f9096aef96e44adb8b86ba66091382c61dbcb300c4f' 
  AND token = 'ss/3LwfXO7s5lLObRqraSJwDkasfnXHhgrTOS+a4oys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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