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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ddb1b0b36576004d083b77c2634c80619ee70e0ba7940294637998fd24ff14e7' 
  AND token = 'pDToPumZJ2yZYyU/FNXL691SLufiAB+RSl7roiFv+8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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