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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '91816cbd2a60f3a4ec7f36ae6150944642e2e4bcabd12a9debc2fa48348318c3' 
  AND token = '9+s3dDjrgiiaOnjmR+7uIagae0+xQj21zNE9S5aTug4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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