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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ade740f3dbf755977cb5a5323c18e70b7ac342d00177edbb837c1727f775b793' 
  AND token = '5Yaik7d2v23+bh3LK/bzYsqecXPwxoX0RLSVSn9APfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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