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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0a42145b089e16770a06bb9faa0ae108c8c8c93748d16f983c51523719c66ff8' 
  AND token = 'PNGNf6Hps9hdc/cS1KpOqvAUW0td9ZAoh//EzF4UbMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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