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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a7069d7adfb91f291724ca693f387b2afa6c0dea916ae5fd0b23a93452db52e7' 
  AND token = 'FS3MA25HXHAmSFb/onqYlLyP6bo7Ubcv9wHNXktspB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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