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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f1b843493ca5998a1009ec6ee383f186a87b751ad0725ccffd4a715d963e0cb5' 
  AND token = 'N7F2P6FNyBWQoeLQwYTn7pbk2bNtoF76sw60upRF5q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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