Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '259cd8e4611f8ae18ad9657955284859aef0a284b73c9c7ef001826abeaab0d6' 
  AND token = 'gODwo1q4CAup35PCDJoMgl9wmTTLgCviYv2OPgmiOxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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