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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7101f56efba14be3f8f9dd2db17f9fbe2c3c023fe84e6c5823e06635996e9780' 
  AND token = '3bGJav3YDlk8vVIi2sQN+1dW0IbRGo3LzmO18eG8v6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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