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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '843966c74bbdd737aa9b63cef17d7937d0b369127169379ae967d2c6341f6ea4' 
  AND token = 'qul3FsH6WIoxe8IWM5qI1tAJNEpQYY/E0LMUJlfYJ3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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