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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a06dc652edbd9069369288e5c30094c80adeacf533e87ba566b783c0189866a6' 
  AND token = '248v5XEiGcn6J5Oz9RQLtjIJycojs/OUWeQ+Ugr95GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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