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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1645018821c02add9342de97769887bc7c9116c6407d64611187eec2c45972b8' 
  AND token = '88aTNyi1RFoNqkZHDPsb0TpXJM7ipZBJXgDLJH+TfFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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