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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '72d91315a07161a576736c23c723cc3b3132971087d673643f700ada0bc6a39a' 
  AND token = '4YBteamLiXW4fGWLv6eGe5zE68x6lXF4TNGkSlG5Ux4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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