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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7060cfd1bda0b2b73036e545b8d1115d7a73a631b3a4da5ddf81520de3ae219f' 
  AND token = '1XxHoLw0TOqUlaOuouQtWPLLsn602L9YpHBfy9Y0oo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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