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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '22f692da27fbbc604c8b1e0e39e9829c2dc94cd43e6b7f6eec15d8340e93068c' 
  AND token = 'g2Md5Q+G7aGiYoin6zrL4CDTNKEyAvtMkAsHMvG3CT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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