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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2886911248631c59e1e6fedff23b9a9009e06a2e77ed7f0bad3486d61866f647' 
  AND token = 'Rxiox+j3+FJId9GhYx5prVRTXVfaKd3qCfBtd1xoLQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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