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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fadca8da3a8af989f0e354267377696caf8db92c9d8875526bb6847f7b87fed2' 
  AND token = '7nDsLFrdd8dIlWTzycCjlWXgieOFUvr305HFyldc40M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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