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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1eb794cec00464e3508637924eb3a298a71db4c8d743c5926492cce87880c959' 
  AND token = 'ievUk6doaDi1NuBYJ144cU4S/FX6uVK95mPkMxWDA7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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